Cutter head for machine tools



1957 L. LE ROY TOWNSEND 1 CUTTER HEAD FOR MACHINE TOOLS f Fi led Dec. 12, 1955 PARKER 2. CARTER ATTORNEYS Uted States. Pa iit CUTTER HEAD FOR MACHINE TOOLS Leon Le Roy Townsend, West Bend, Wis.

Application December 12, 1955, Serial No. 552,580

2 Claims. (Cl. 77-58) My invention relates to cutter heads, and more particularly to a device that replaces large drills with an interchangeable tool bit.

It is manifest to anyone familiar with the art that a single head adaptable for use with a standard arbor, is convenient and serviceable, especially when the tool bit can be removed and replaced without special tools or special mechanical skill.

One object of my invention is to provide an especially simple and economical device for use with various machine tools such as lathes, milling machines, drill presses, turret lathes or the like, and which may be employed for spot facing, counter boring, or for boring deep holes.

Another object of my invention is to provide a device in which the pilot and tool bit may be easily changed without the use of special tools or special mechanical skill.

Other and further objects of my invention will become more apparent as the description proceeds, when taken in conjunction with the drawing, in which:

Figure 1 is a perspective view of the assembled dev1ce.

Figure 2 is a perspective view of the pilot sleeve.

Figure 3 is a perspective view of the slotted pilot.

Figure 4 is a perspective view of the cutter head, with a part of its integral shank broken away.

Figure 5 is a perspective view of a conventional type of split retaining ring.

Figure 6 is a perspective used with the device.

Figure 7 is a top view of the assembled device.

Figure 8 is a cross-sectional view of the assembled head, taken at the line 8-8 of Figure 7, and

Figure 9 is a similar cross section of the head, taken at the line 99 of Figure 7.

Referring now to details of the embodiment of the invention shown in the drawings 10 indicates a shank or stem of the device, which may be tapered in a conventional manner as shown as an integral part of the shank or stem, but may be separately attached thereto in any conventional manner. The head has a concentric bore 12 opening to the upper end thereof. Two of the opposite walls of the head 11 have notched recesses 13 to accommodate the lower edge of a tool bit 14. The upper face of said tool bit is recessed intermediate its ends at 16, and has its outer ends 15 and 15' ground to a cutting edge. The head 11 has set screws 17 threadedly extending through the opposite sides of the head beneath each of the tool notches 13.

A pilot 18 has a longitudinal bit-receiving slot 19 extending there-through intermediate its ends. A concentrically disposed screw 21 threadedly extends through the upper end of the pilot 18 and into the upper end of the open slot 19 in the latter. The pilot 18 has a circular groove around its upper end for engagement by a split collar, or retaining ring 27 shown in Figure 5. The pilot 18 also has an outwardly flanged integral guide collar view of the tool bit to be 22 near its lower end, broken at opposite sides by the openings 19. A bottom collar 23, also integral with the pilot 18, has a pair of opposed upright grooves 24 therein disposed at right angles to the slot 19, to permit passage of the ends of the screws 17 at certain times, as will presently appear.

Figure 2 shows an annular pilot sleeve 28 with a central bore 29 which is adapted to fit over the upper end of the pilot 18. The bottom face of this pilot sleeve has opposed notches 30 to accommodate the upper edge of, the tool-bit 14. The exterior walls of the head 11 may be cut away as at 25, 26 adjacent the leading edges of the bit receiving notches 13 to facilitate the clearing of cuttings from the bit 14.

From the above description it will be manifest that the entire unit is assembled as follows:

The bottom end of the pilot 18 may be inserted in the bore 12 of the head 11 in such an angular relation so that the inner ends of the screws 17 may pass through the grooves 24 in the collar 23 and enter the circular space between the collars 22 and 23. Then, by rotating the pilot through degrees, the bit-receiving slot 19 in pilot 18 will be brought into alignment with the opposed notches 13 in the head 11. This permits insertion of the tool-bit 14 through the slot 19 with the lower part of the tool bit registering with the notches 13 of the latter. The pilot sleeve 28 is then applied over the pilot 18 so that the notches 30 in the pilot sleeve engage the upper part of the tool-bit 14. The retaining ring 27 is then fixed in the circular groove 20 in the pilot 18, and against the upper face of the sleeve 28, to hold the latter in place on the pilot.

By maintaining adjustment of the screws 17 in the head 11 so that they engage the upper face of the bottom collar 23, the pilot 18 will be retained in the bore 12 as long as the tool bit is in the slot 19. Adjustment of the center screw 21 in the pilot 18 with the inner end of the screw 21 engaged in the recess 16 in the tool bit 14 will hold the tool-bit in position.

When changing the tool-bit, it is only necessary to loosen the screw 21, which will permit the tool-bit 14 to be removed and replaced. The pilot can further be disassembled, if desired, by rotating it in the bore so that the screws 17 may pass through the slots 23 in the bottom collar 23.

Obviously, the size and shape of the shank or stem of the bit holding device of my invention may be varied as required for use in many different types of machine tools such as lathes, milling machines, drill presses, turret lathes or the like.

Although I have shown and described a certain embodiment of the invention, it will be understood that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

I claim:

1. A rotary cutter head having a shank with a concentric bore opening at the outer end thereof, and bit-receiving notches inopposite edges of said bore, a generally cylindrical pilot stern fitting endwise in said bore, said bore having a bit-receiving slot extending longitudinally thereof intermediate its ends, a retaining collar at its inner end and a concentric guide collar intermediate its ends broken by said longitudinal slot, an axially disposed set screw threaded in the upper end of said pilot stem for projection into said longitudinal slot, a sleeve adapted for fitting engagement on the outer end of said pilot stem having opposed bit-receiving notches on its under face,

Patented Oct. 29, 1957 means for detachably securing said sleeve on said pilot stem, and set screw means threadedly passing through the side wall of said bit for engagement with the retaining 3 a t collar on the inner end of said pilot stem, to hold the the. cutter head shank are cut away adjacent the leading latter against removal from said head whereby an e1 edges of the bit receiving notches therein, to aid in cleargated bit may be passed through the slot in said stein in mg Cuttings from the headalignment with the notches in said cutter head and the notches in said sleeve respectively, and be engaged by the 5 References Cited in the file of this Patent said axially disposed set screw to secure said bit in said UNITED STATES PATENTS Cutter 897,041 Weller Aug, 25, 1903 2. The structure of claim 1, Wherein'the side Walls Of 1,332,898 Hossie et a1. Mar. 9, 1920 

